Introduction
The Allen-Bradley MPL-B320P-SJ24AA Servo Motor is part of the MP-Series MPL family of low-inertia brushless permanent-magnet servo motors. It is designed for precision motion-control applications where high rotational speed, accurate feedback, and dependable servo response are required.
The motor combines a 100 mm frame size with a 50.8 mm magnetic stack and a rated speed of 5000 RPM. This configuration provides a useful balance between motor size and dynamic performance for industrial automation equipment.
A key feature of the MPL-B320P-SJ24AA is its single-turn high-resolution encoder. The encoder provides precise rotor-position information to the servo drive, allowing the control system to regulate motor position, speed, and torque during machine operation.
The motor also incorporates a 24 V DC holding brake. The brake can be particularly important on vertical axes, lifting mechanisms, and other gravity-loaded applications. When designing a machine, the brake should be treated as a holding device rather than relying on it as the primary method for routine dynamic stopping.
The keyed shaft provides a traditional mechanical connection for machine components. This distinguishes the SJ24AA from keyless-shaft variants in the MPL-B320P family. When selecting a replacement motor, the shaft configuration should therefore be checked carefully to ensure compatibility with the existing coupling or transmission.
The motor's circular bayonet connector is arranged at a right angle and can be rotated 180°. This can simplify cable routing in machines where installation space around the motor is restricted.
The MPL-B320P-SJ24AA is also associated with Kinetix motion-control systems and other compatible Allen-Bradley servo platforms. Proper motor selection should always consider the complete motion system, including servo drive compatibility, feedback interface, motor voltage, brake requirements, and mechanical mounting.
The model is also listed as discontinued by the manufacturer, so replacement planning should pay particular attention to exact electrical, mechanical, and feedback specifications rather than selecting a replacement solely according to frame size.
Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | Allen-Bradley |
| Manufacturer | Rockwell Automation |
| Product Family | MP-Series MPL |
| Product Type | Rotary Servo Motor |
| Model | MPL-B320P-SJ24AA |
| Motor Technology | Permanent-Magnet Low-Inertia Servo Motor |
| Voltage Class | 400/460 VAC |
| Frame Size | 100 mm / Frame 3 |
| Magnetic Stack Length | 50.8 mm (2.0 in.) |
| Rated Speed | 5000 RPM |
| Continuous Stall Torque | Approx. 3.05 Nm |
| Peak Stall Torque | Approx. 7.91 Nm |
| Rated Output | Approx. 1.5 kW |
| Feedback | Single-Turn High-Resolution Encoder |
| Encoder Resolution | 1024 Sin/Cos Cycles |
| Feedback Protocol | Hiperface |
| Shaft Configuration | Keyed Shaft |
| Shaft Seal | No Shaft Seal |
| Brake | 24 V DC Brake |
| Connector | Circular Bayonet, Right-Angle |
| Connector Rotation | 180° Rotatable |
| Mounting Flange | IEC Metric |
| Mounting Holes | Free Mounting Holes, Type FF |
| Dimensions | Not specified in the supplied product data |
| Weight | 4.08 kg (9.00 lb) |
| Lifecycle | Discontinued |
Recommended Related Models
The following MPL-B320P models are useful for comparing different feedback, shaft, and brake configurations:
- MPL-B320P-SJ22AA – Single-turn high-resolution encoder, keyed shaft, no brake
- MPL-B320P-RJ72AA – Resolver feedback, keyed shaft, no brake
- MPL-B320P-RJ74AA – Resolver feedback, keyed shaft, 24 V DC brake
- MPL-B320P-RK72AA – Resolver feedback, keyless shaft, no brake
- MPL-B320P-RK74AA – Resolver feedback, keyless shaft, 24 V DC brake
- MPL-B320P-MK72AA – Multi-turn high-resolution feedback, keyless shaft, no brake
- MPL-B320P-MK74AA – Multi-turn high-resolution feedback, keyless shaft, 24 V DC brake
- MPL-B320P-MJ74AA – Multi-turn high-resolution feedback, keyed shaft, 24 V DC brake
- MPL-B320P-SJ72AA – Single-turn high-resolution feedback, keyed shaft, no brake
The closest configuration comparison is often between the SJ24AA and other MPL-B320P motors using single-turn encoder feedback, while resolver and multi-turn encoder versions should be evaluated according to the requirements of the existing motion-control architecture.
Popular Related Models
For Allen-Bradley MP-Series MPL servo applications, the following models are commonly compared with the MPL-B320P-SJ24AA:
- Allen-Bradley MPL-B320P-SJ22AA – Single-turn encoder, keyed shaft, no brake
- Allen-Bradley MPL-B320P-RJ72AA – Resolver, keyed shaft, no brake
- Allen-Bradley MPL-B320P-RJ74AA – Resolver, keyed shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-RK72AA – Resolver, keyless shaft, no brake
- Allen-Bradley MPL-B320P-RK74AA – Resolver, keyless shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-MK72AA – Multi-turn high-resolution feedback, keyless shaft, no brake
- Allen-Bradley MPL-B320P-MK74AA – Multi-turn high-resolution feedback, keyless shaft, 24 V DC brake
- Allen-Bradley MPL-B320P-MJ74AA – Multi-turn high-resolution feedback, keyed shaft, 24 V DC brake
When replacing an MPL-B320P-SJ24AA, verify the 100 mm frame, 50.8 mm stack length, 5000 RPM speed, single-turn encoder feedback, keyed shaft, 24 V DC brake, connector configuration, and mounting arrangement. Matching only the motor frame size is not sufficient to establish replacement compatibility.
